Drug interactions
Pentazocine + Venlafaxine
Severity: Moderate
Pentazocine and Venlafaxine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Venlafaxine, a serotonin-norepinephrine reuptake inhibitor, may add to the serotonergic effect of pentazocine and raise the chance of serotonin syndrome. Data specific to pentazocine are limited.
What this interaction means in plain words
Pentazocine and Venlafaxine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Pentazocine belongs to Musculoskeletal; Venlafaxine belongs to Central Nervous System.
Why it happens
Possible additive serotonergic effect; the contribution of pentazocine is not well established.
What to do
Monitor for agitation, clonus, tremor, sweating and hyperthermia, particularly after dose changes. Stop the combination if serotonin toxicity is suspected.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Pentazocine
- Calcium / magnesium / potassium / sodium oxybates + Pentazocine Contraindicated
- Olanzapine / samidorphan + Pentazocine Contraindicated
- Pentazocine + Phenelzine Contraindicated
- Pentazocine + Tranylcypromine Contraindicated
- Alfentanil + Pentazocine Major
- Alprazolam + Pentazocine Major
Other interactions of Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine Contraindicated
Frequently asked questions
Can I take Pentazocine with Venlafaxine?
MediHelp rates the interaction as moderate. Pentazocine and Venlafaxine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Venlafaxine, a serotonin-norepinephrine reuptake inhibitor, may add to the serotonergic effect of pentazocine and raise the chance of serotonin syndrome. Data specific to pentazocine are limited.
How serious is the interaction between Pentazocine and Venlafaxine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for agitation, clonus, tremor, sweating and hyperthermia, particularly after dose changes. Stop the combination if serotonin toxicity is suspected.
What other medicines interact with Pentazocine?
MediHelp also lists interactions of Pentazocine with, for example, Calcium / magnesium / potassium / sodium oxybates, Olanzapine / samidorphan, Phenelzine. The full list is on the Pentazocine page.
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